Syntiflesh is defined twice, both as a food/snack and obj/item/weapon. The first one is edible while the second one is not.

This PR comments out the non-edible one and replaces any reference of it to the edible one.
Removed commented out useless crap.
Merge pull request #5560 from faerindel/synthifleshfixin2

Solving syntiflesh duplication.